<html> <head> <style></style> </head> <body class='hmmessage'> In order for my pdf file to look nicer, I changed the background to black, and now I need to emphasize a number of lines between certain coordinates. Some lines need to be shown as red, some as green, and some as blue, or a variation. I tested the above requirement with the code below:   cairo_set_line_width (cr, .5);   cairo_set_source_rgb(cr, 1, 0, 0);   cairo_move_to (cr, 152.84, -50.0);   cairo_line_to (cr, 83.97, 30.93);   cairo_stroke_preserve(cr);     cairo_set_source_rgb(cr, 0, 0, 1);   cairo_move_to(cr, 90, 1);   cairo_line_to(cr, 40, 1);   cairo_stroke_preserve(cr); ...................................... However, both lines are displayed as blue, with a very thin red line in the middle of it. Is there a way to specify that one line needs to be only blue, and the other only red? What would be the code to try? I appreciate your help. </body> </html>